Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A communication destination determination device comprising: a signal transmitter configured to transmit a second signal in response to a first signal to a communication destination when the first signal is received from the communication destination via a communication network; a communication destination determiner configured to determine whether or not the communication destination is suspicious as a threat on a basis of whether or not a third signal transmitted from the communication destination is received within a certain time period after a timing of transmission of the second signal; a signal selector configured to search a signal serving a trigger by the communication destination based on the determination result and select a signal different from each of signals that have been transmitted to the communication destination; a history specifier configured to read a signal from communication history information including the second signal transmitted to the communication destination when the first signal is received from the communication destination; and a history updater configured to add the second signal transmitted by the signal transmitter to the communication history information, wherein the signal selector selects a signal different from the signal read by the history specifier from signal information including a signal transmittable to the communication destination, and the signal transmitter transmits the signal selected by the signal selector to the communication destination as the second signal.
A device for identifying suspicious communication threats receives a first signal from a communication destination. In response, it sends a second signal. Simultaneously, it reads a previous second signal sent to that destination from communication history. Based on whether the destination was previously deemed a threat, it selects a new, different second signal from a pool of available signals, ensuring it's distinct from what was just read from history. This newly selected signal is then transmitted as the second signal. If a third signal is not received from the destination within a set time after transmitting the second signal, the device determines the destination is likely suspicious. The transmitted second signal is then added to the communication history.
2. The communication destination determination device according to claim 1 , further comprising: a history information storage capable of storing the communication history information including communication information in which a communication destination identifier, which is able to identify the communication destination, and the second signal, which has been transmitted to the communication destination, are associated with each other, wherein, when a fourth signal is received from a certain communication destination, the history specifier specifies a signal associated with a communication destination identifier indicating the certain communication destination in the communication history information, the signal selector selects a signal different from the signal specified by the history specifier from the signal information, and the history updater generates communication information in which a communication destination identifier, which has been transmitted by the signal transmitter and indicates the communication destination, and the second signal, which has been transmitted by the signal transmitter, are associated with each other, and adds the generated communication information to the communication history information.
A device for identifying suspicious communication threats, as described in Claim 1, additionally includes a storage for communication history. This history records communication details, associating a unique identifier for each communication destination with the specific second signal previously sent to it. When a new signal (a fourth signal) is received from a particular communication destination, the device uses its identifier to locate the corresponding previously transmitted second signal in history. It then selects a new second signal from available options that is different from this identified historical signal. Finally, it creates a new history entry linking the destination's identifier with the new second signal just transmitted, adding this to the communication history.
3. The communication destination determination device according to claim 1 , further comprising: a history information storage capable of storing the communication history information including communication information in which a time zone, in which the first signal has been received, and the second signal, which has been transmitted with respect to the first signal, are associated with each other, wherein, when a fourth signal is received in a certain time zone, the history specifier specifies a signal associated with the certain time zone in the communication history information, the signal selector selects a signal different from the signal specified by the history specifier from the signal information, and the history updater generates communication information in which the certain time zone, and the second signal, which has been transmitted by the signal transmitter, are associated with each other, and adds the generated communication information to the communication history information.
A device for identifying suspicious communication threats, as described in Claim 1, additionally includes a storage for communication history. This history records communication details, associating the time zone when a first signal was received with the specific second signal transmitted in response. When a new signal (a fourth signal) is received in a particular time zone, the device uses this time zone to locate the corresponding previously transmitted second signal in history. It then selects a new second signal from available options that is different from this identified historical signal. Finally, it creates a new history entry linking the current time zone with the new second signal just transmitted, adding this to the communication history.
4. The communication destination determination device according to claim 1 , further comprising: a history information storage capable of storing the communication history information including communication information in which a time zone, in which the first signal has been received from the communication destination, a communication destination identifier, which is able to identify the communication destination, and the second signal, which has been transmitted in response to the first signal, are associated with each other, wherein, when a fourth signal is received from a communication destination indicated by a certain communication destination identifier in a certain time zone, the history specifier specifies a signal associated with the certain communication destination identifier and the certain time zone in the communication history information, the signal selector selects a signal different from the signal specified by the history specifier from the signal information, and the history updater generates communication information in which the certain communication destination identifier, the certain time zone, and the second signal, which has been transmitted by the signal transmitter, are associated with each other, and adds the generated communication information to the communication history information.
A device for identifying suspicious communication threats, as described in Claim 1, additionally includes a storage for communication history. This history records communication details, associating the time zone when a first signal was received, a unique identifier for the communication destination, and the specific second signal transmitted in response. When a new signal (a fourth signal) is received from a particular destination (identified by its unique identifier) and in a specific time zone, the device uses both the identifier and the time zone to locate the corresponding previously transmitted second signal in history. It then selects a new second signal from available options that is different from this identified historical signal. Finally, it creates a new history entry linking the destination's identifier, the time zone, and the new second signal just transmitted, adding this to the communication history.
5. The communication destination determination device according to claim 1 , wherein the signal transmitter does not transmit the second signal when the signal selector determines that the signal different from the signal specified by the history specifier is not included in the signal information.
A device for identifying suspicious communication threats, as described in Claim 1, transmits a second signal to a communication destination in response to a first signal, and then determines if the destination is suspicious based on whether a third signal is received within a certain time. This device further operates such that if the system is unable to find an available second signal that is different from the one previously sent to that destination (as read from history), then no second signal is transmitted at all. This prevents sending repetitive or exhausted challenge signals.
6. A communication destination determination method comprising: transmitting a second signal in response to a first signal to a communication destination when the first signal is received from the communication destination via a communication network; determining whether or not the communication destination is suspicious as a threat on a basis of whether or not a third signal transmitted from the communication destination is received within a certain time period after a timing of transmission of the second signal; searching a signal serving a trigger by the communication destination based on the determination result; selecting a signal different from each of signals that have been transmitted to the communication destination; reading a signal from communication history information including the second signal transmitted to the communication destination when the first signal is received from the communication destination; and adding the second signal to the communication history information; selecting a signal different than the signal that has been read from the communication history information, from signal information including a signal transmittable to the communication destination; transmitting the selected signal by the signal selector to the communication destination as the second signal.
A method for identifying suspicious communication threats involves: receiving a first signal from a communication destination; reading a previous second signal sent to that destination from communication history; searching and selecting a new, different second signal from available options, ensuring it's distinct from what was just read, and potentially influenced by prior threat determinations; transmitting this selected second signal to the destination; adding this transmitted second signal to the communication history; and finally, determining if the destination is suspicious based on whether a third signal is received from it within a certain time after transmitting the second signal.
7. A non-transitory recoding medium storing a communication destination determination program recorded therein, the program making a computer achieve: a signal transmission function configured to transmit a second signal in response to a first signal to a communication destination when the first signal is received from the communication destination via a communication network; a communication destination determination function configured to determine whether or not the communication destination is suspicious as a threat on a basis of whether or not a third signal transmitted from the communication destination is received within a certain time period after a timing of transmission of the second signal; a signal selector function configured to search a signal serving a trigger by the communication destination based on the determination result and select a signal different from each of signals that have been transmitted to the communication destination; a history specifier function configured to read a signal from communication history information including the second signal transmitted to the communication destination when the first signal is received from the communication destination; and a history updater function configured to add the second signal transmitted by the signal transmission function to the communication history information, wherein the signal selector function selects a signal different from the signal read by the history specifier from signal information including a signal transmittable to the communication destination, and the signal transmission function transmits the signal selected by the signal selector function to the communication destination as the second signal.
A non-transitory recording medium stores a program that enables a computer to identify suspicious communication threats. The program includes functions to: transmit a second signal to a communication destination in response to receiving a first signal; determine if the destination is suspicious based on whether a third signal is received within a certain time after the second signal's transmission; search for and select a different second signal based on past threat determinations, ensuring it hasn't been recently transmitted; read a previously sent second signal from communication history; and add the newly transmitted second signal to the history. Specifically, the program selects a second signal that differs from the one read from history and then transmits this selected signal.
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August 4, 2020
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